Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quantos passageiros em trânsito no aeroporto de Londres Gatwick?
 ###Tabelas: CREATE TABLE 2009_data (2009_data_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Airport VARCHAR, Total Passengers INT, % Change 2008/2009 VARCHAR, International Passengers INT, Domestic Passengers INT, Transit Passengers INT, Aircraft Movements INT, Freight ( Metric Tonnes ) INT) CREATE TABLE standard_gauge_designs_1870_to_1899 (standard_gauge_designs_1870_to_1899_id AUTO_INCREMENT PRIMARY KEY, Railway VARCHAR, Built INT, Wheels VARCHAR, Location VARCHAR, ObjectNumber VARCHAR) CREATE TABLE fares (fares_id AUTO_INCREMENT PRIMARY KEY, Type of Fare VARCHAR, Cash Fare VARCHAR, Day Pass VARCHAR, 31-Day Pass VARCHAR, Monthly Pass VARCHAR) CREATE TABLE match_logs_and_statistics (match_logs_and_statistics_id AUTO_INCREMENT PRIMARY KEY, Player VARCHAR, Matches INT, Innings INT, Runs INT, Average VARCHAR, Highest score VARCHAR, 100s INT, 50s INT) CREATE TABLE judges (judges_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Appointed INT, Term expiration INT, Appointing Governor VARCHAR, Law School Attended VARCHAR)  
SELECT Transit Passengers FROM 2009_data WHERE Airport = London Gatwick